Question: Within the Vakhsh River, where did Alp Arslan die?
Paraphrase: Inside the Vakhsh Waterway, where did High mountain Arslan die?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q200193 wdt:P20 ?answer . ?answer wdt:P974 wd:Q8526}
Answer: Amu Darya